RFR: 8256154: Some TestNG tests require default constructors

[Conor Cleary]

On Thu, 19 Nov 2020 16:44:52 GMT, Lance Andersen <lancea at openjdk.org> wrote:

>> `depth` is `final`, so it needs to be assigned. but this could be replaced with `this(0)`
>
> Ah, missed the final on depth :-)

Any particular strengths associated with `this(0)` as opposed to the actual assignment? Aside from the brevity it provides of course. Happy to modify the PR to include it

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PR: https://git.openjdk.java.net/jdk/pull/1317